Posttranslational Arginylation Enzyme Arginyltransferase1 Shows Genetic Interactions With Specific Cellular Pathways...

Area of Science:

• Molecular Biology
• Cell Biology
• Biochemistry

Background:

• Arginyltransferase1 (ATE1) mediates posttranslational arginylation, a process implicated in various mammalian diseases.
• The physiological role of ATE1 in vivo remains largely undetermined, hindering disease pathogenesis interpretation.
• ATE1 is conserved in eukaryotes, including the model organism Schizosaccharomyces pombe (S. pombe).

Purpose of the Study:

• To systematically investigate the in vivo physiological functions of ATE1.
• To identify genes interacting with ATE1 using a genome-wide genetic screen in S. pombe.
• To elucidate the cellular processes regulated by ATE1.

Main Methods:

• Utilized the S. pombe gene-knockout library for a systematic genetic interaction screen.
• Tested genetic interactions between ate1 and 3659 other genes (approximately 75% of the S. pombe genome).
• Clustered interacting genes based on functional or physical associations.

Main Results:

• ATE1 demonstrated a surprisingly focused impact, with significant genetic interactions observed for less than 5% of tested genes.
• ATE1-interacting partners were functionally categorized into groups including translation/transcription, metabolism, cell morphology, stress response, ribosomal function, and mitochondrial function.
• Contrary to expectations, few interactions were found with genes involved in ubiquitination or protein degradation pathways.

Conclusions:

• ATE1 specifically regulates a limited set of cellular processes in vivo.
• The identified ATE1-interacting partners provide mechanistic insights into ATE1's role in physiology and disease.
• This study clarifies the in vivo function of ATE1, moving beyond biochemical assumptions.